{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,4]],"date-time":"2026-06-04T09:35:19Z","timestamp":1780565719624,"version":"3.54.1"},"reference-count":29,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2002,8,2]],"date-time":"2002-08-02T00:00:00Z","timestamp":1028246400000},"content-version":"vor","delay-in-days":1,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J Agronomy Crop Science"],"published-print":{"date-parts":[[2002,8]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Little is known about the effect of combined phosphorus and nitrogen (P\u2010N) fertilization on the N requirement of sunflower (<jats:italic>Helianthus annus<\/jats:italic> L.). This study was carried out to evaluate the effects of varying levels of P and N, as well as the interaction P \u00d7\u200aN, on the N uptake, yield and N apparent utilization efficiency under field conditions. Split\u2010plot design experiments were conducted in the mid\u2010western Pampas in Argentina. Four levels of N (0, 46, 92 and 138\u2003kg\u2003N\u2003ha<jats:sup>\u22121<\/jats:sup>) and three levels of P (0, 12 and 40\u2003kg\u2003P ha<jats:sup>\u22121<\/jats:sup>) were applied to two Typic Hapludolls over two growing seasons (1997\u201398 and 1998\u201399). N uptake and soil N\u2010NO<jats:sub>3<\/jats:sub> contents were determined at the V<jats:sub>7<\/jats:sub>, R<jats:sub>5<\/jats:sub> and R<jats:sub>9<\/jats:sub> growth stages. The sunflower yield ranged from 2.5 to 5.0\u2003Mg\u2003ha<jats:sup>\u22121<\/jats:sup>. The total N requirement was around 45\u2003kg\u2003N\u2003Mg<jats:sup>\u22121<\/jats:sup>\u2003grain, and this result suggests that it is not necessary to use different N requirements (parameter b) for fertilized crops when a yield response is expected. To achieve a 100\u2003% yield maximum a N supply (soil plus fertilizer) of 181\u2003kg\u2003N\u2003ha<jats:sup>\u22121<\/jats:sup> at P<jats:sub>40<\/jats:sub> was needed. However, at P<jats:sub>0<\/jats:sub>, the highest yield was about 80\u2003% of the maximum yield with a N supply (soil plus fertilizer) of 164\u2003kg\u2003N\u2003ha<jats:sup>\u22121<\/jats:sup>. P application increased the apparent use efficiency of the supplied N.<\/jats:p>","DOI":"10.1046\/j.1439-037x.2002.00570.x","type":"journal-article","created":{"date-parts":[[2003,3,12]],"date-time":"2003-03-12T02:58:41Z","timestamp":1047437921000},"page":"267-274","source":"Crossref","is-referenced-by-count":56,"title":["Effect of Phosphorus and Nitrogen Fertilization on Sunflower (<i>Helianthus annus<\/i> L.) Nitrogen Uptake and Yield"],"prefix":"10.1111","volume":"188","author":[{"given":"M. M.","family":"Zubillaga","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J. P.","family":"Aristi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"R. 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